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elmlang
|
general
|
That said, Rust has a much more substantial learning curve than most other languages because it has a pretty unique memory/pointer management model and that takes some getting used to.
|
2019-03-25T09:23:47.676200
|
Dede
|
elmlang
|
general
|
more than C++?
|
2019-03-25T09:24:09.676400
|
Nana
|
elmlang
|
general
|
The model is much better than C++’s.
|
2019-03-25T09:24:30.676600
|
Dede
|
elmlang
|
general
|
But there are significant differences.
|
2019-03-25T09:24:50.676800
|
Dede
|
elmlang
|
general
|
It also inhibits random memory access, which makes non-FP bearable to FP people.
|
2019-03-25T09:25:00.677100
|
Niesha
|
elmlang
|
general
|
Sadly, no effect system though
|
2019-03-25T09:25:08.677300
|
Niesha
|
elmlang
|
general
|
I should maybe write a Rust tutorial for Elmists.
|
2019-03-25T09:25:10.677500
|
Dede
|
elmlang
|
general
|
Yeah, most of the core is written in a way that lets you write FP.
|
2019-03-25T09:25:35.677700
|
Dede
|
elmlang
|
general
|
so it has lambdas and proper closures?
|
2019-03-25T09:26:53.677900
|
Nana
|
elmlang
|
general
|
“It’s complicated” :wink:
|
2019-03-25T09:27:04.678100
|
Dede
|
elmlang
|
general
|
Mostly the answer is “yes”.
|
2019-03-25T09:27:22.678300
|
Dede
|
elmlang
|
general
|
Actually: it’s a full yes, but subject to the borrow checker.
|
2019-03-25T09:27:38.678500
|
Dede
|
elmlang
|
general
|
So you can write this, where the `||` is a closure taking no arguments and `|req|` is a closure taking one argument:
```
my.code(|| {
service_fn(move |req| {
serve_https(config, req)
})
```
|
2019-03-25T09:29:10.678700
|
Dede
|
elmlang
|
general
|
But there are two complexities that come up.
|
2019-03-25T09:29:49.678900
|
Dede
|
elmlang
|
general
|
`config` and `req` are captured variables.
|
2019-03-25T09:30:05.679400
|
Dede
|
elmlang
|
general
|
Let’s say `req` isn’t referenced from anywhere else after this. Then the data can `move` into the closure — thus the keyword in front of `|req|`
|
2019-03-25T09:30:48.680200
|
Dede
|
elmlang
|
general
|
But say `config` is — then you have a problem that this closure doesn’t control the lifetime of `config` necessarily.
|
2019-03-25T09:31:21.680700
|
Dede
|
elmlang
|
general
|
Now, if `config` is of a type that implements `Copy` trait, no problem, the compiler will automatically copy it.
|
2019-03-25T09:31:44.680900
|
Dede
|
elmlang
|
general
|
But realistically, it is not.
|
2019-03-25T09:31:48.681100
|
Dede
|
elmlang
|
general
|
<@Valeria> We use Scala (as a FP language, not a better Java) with Sangria (<https://github.com/sangria-graphql/sangria>), but I sadly cannot recommend it fully. But it might be worth to check it out - just in case it fits nonetheless.
|
2019-03-25T09:31:49.681300
|
Timika
|
elmlang
|
general
|
So you wind up writing this:
```
my.code(move || {
let config = config.clone();
service_fn(move |req| {
let config = config.clone();
serve_https(config, req)
})
})
```
|
2019-03-25T09:32:03.681400
|
Dede
|
elmlang
|
general
|
That’s the level at which manual management can bite.
|
2019-03-25T09:32:11.681600
|
Dede
|
elmlang
|
general
|
“manual”
|
2019-03-25T09:32:16.681800
|
Dede
|
elmlang
|
general
|
The borrow checker warns you — without the extra ` clone` calls the code won’t compile.
|
2019-03-25T09:33:08.682300
|
Dede
|
elmlang
|
general
|
Rust feels too low level for most applications
|
2019-03-25T09:35:43.682500
|
Kris
|
elmlang
|
general
|
~It’s actually not.~
|
2019-03-25T09:35:54.683100
|
Dede
|
elmlang
|
general
|
Let me retract that.
|
2019-03-25T09:36:01.683500
|
Dede
|
elmlang
|
general
|
I would recommend purescript if you want something Elm like for a backend
|
2019-03-25T09:36:03.683700
|
Kris
|
elmlang
|
general
|
That has not been my experience.
|
2019-03-25T09:36:05.683900
|
Dede
|
elmlang
|
general
|
Once the learning curve is achieved, I have not found it to be notably less productive than ‘higher level’ languages.
|
2019-03-25T09:36:48.684200
|
Dede
|
elmlang
|
general
|
I've coded Scala for 4 years (now full PureScript), tell me your pains so I can add them to my list :smile:
|
2019-03-25T09:43:15.684500
|
Niesha
|
elmlang
|
general
|
Yeah, it’s far from perfect. We had Scala at our company before switching to pure-FP some time ago. In that sense, having Scala already established was a big help. But now we’re looking for something better… But if I would say one thing about Scala I dislike the most, it’s “implicit hell”, especially with libraries like `cats`.
|
2019-03-25T09:45:27.685000
|
Timika
|
elmlang
|
general
|
<@Valeria> if you want I can show a small bootstrap of what we currently use at a future meetup.
We currently use Haskell, without complicated extensions, it's quite close to Elm overall.
|
2019-03-25T09:46:49.687400
|
Caron
|
elmlang
|
general
|
We had code break at runtime because an implicit was missing. Compiled fine, but had totally different runtime result. :disappointed:
|
2019-03-25T09:48:37.687600
|
Timika
|
elmlang
|
general
|
I’m interested in a Haskell setup that is close to Elm - can you elaborate a bit what you think are do’s and dont’s? You mentioned complicated extensions, what qualifies as a complicated extension for you personally?
|
2019-03-25T09:50:03.687800
|
Timika
|
elmlang
|
general
|
Most of them? :stuck_out_tongue:
|
2019-03-25T09:50:54.688200
|
Kris
|
elmlang
|
general
|
Do you enforce this by some guideline document or is just every developer on the same page and tradeoffs between complexity and gain are made on the fly?
|
2019-03-25T09:51:01.688500
|
Timika
|
elmlang
|
general
|
I heard that `OverloadedStrings` is basically a _must_. Do you think that’s true?
|
2019-03-25T09:51:44.689100
|
Timika
|
elmlang
|
general
|
Yeah
|
2019-03-25T09:52:07.689800
|
Kris
|
elmlang
|
general
|
_Someone_ needs to write a blogpost about this. *cough* *cough*
|
2019-03-25T09:52:22.690200
|
Timika
|
elmlang
|
general
|
I have a lot of requests to a service that uses authentication. Sometimes the token expires and I get a 401 responsen and then I need to make a refresh request, update local storage though ports and the redo the initial request. Do anyone have a _good_ solution for this? I have tried one where I use Task so make a chain of requests with refresh and retry and then in the response sets both the response to the request and new session credentials in i got some. But it feels complex and I need to add credentials to every msg I have.
|
2019-03-25T09:54:02.691900
|
Luba
|
elmlang
|
general
|
I was joking when I said most of them, when you read about them you can recognize which are "complicated", some are required for specific libraries, etc
|
2019-03-25T09:54:20.692000
|
Kris
|
elmlang
|
general
|
Tbh, there are _tons_ of blog posts explaining extensions, see <https://ocharles.org.uk/pages/2014-12-01-24-days-of-ghc-extensions.html> for a pretty cool one
|
2019-03-25T09:55:03.692200
|
Kris
|
elmlang
|
general
|
I find it incredibly hard to get into Haskell, not the language, but the ecosystem and best practices.
|
2019-03-25T09:55:30.692400
|
Timika
|
elmlang
|
general
|
Yes, the ecosystem (package management and stuff) is terrible in my opinion.
|
2019-03-25T09:56:13.693200
|
Kris
|
elmlang
|
general
|
We had a “getting started with haskell” brownbag session. And most folks had to compile IDE support (<https://github.com/haskell/haskell-ide-engine>) from source and we basically did not do anything. It was very telling.
|
2019-03-25T09:57:04.694100
|
Timika
|
elmlang
|
general
|
And another question. Is there a differens between Http.request and Http.task. When using Http.task I get a 403 from the server even though the arguments are identical (except that task doesn't take "tracker").
|
2019-03-25T09:57:33.694800
|
Luba
|
elmlang
|
general
|
Yup, that's pretty much it, I use nix which alleviates some of that (it has binary caches with prevent you from having to build some things from source) but it's still quite flaky
|
2019-03-25T09:59:12.695100
|
Kris
|
elmlang
|
general
|
Our setup on the backend is Servant + Elm-export (it generates elm equivalent types to your haskell types, and all the encoders/decoders you need). We then basicly only use the very basic things : custom types, maps, folds, etc.
|
2019-03-25T09:59:19.695300
|
Caron
|
elmlang
|
general
|
There is, indeed a bit of complexity in a part of our system which I won't name (it starts with M), but people don't need to manipulate it when creating new feature.
|
2019-03-25T10:00:09.695500
|
Caron
|
elmlang
|
general
|
And I had to implement my own resolver like this:
```resolveJson : Json.Decode.Decoder a -> Http.Resolver Http.Error a
resolveJson decoder =
Http.stringResolver <|
\response ->
case response of
Http.BadUrl_ url ->
Err (Http.BadUrl url)
Http.Timeout_ ->
Err Http.Timeout
Http.NetworkError_ ->
Err Http.NetworkError
Http.BadStatus_ metadata body ->
Err (Http.BadStatus metadata.statusCode)
Http.GoodStatus_ metadata body ->
case Json.Decode.decodeString decoder body of
Ok value ->
Ok value
Err err ->
Err (Http.BadBody (Json.Decode.errorToString err))
```
|
2019-03-25T10:02:03.696200
|
Luba
|
elmlang
|
general
|
We use lots of extensions, but they don't really require knowledge (OverloadedStrings, DeriveGeneric, FlexibleContexts, etc).
|
2019-03-25T10:02:21.696300
|
Caron
|
elmlang
|
general
|
It fails on the OPTIONS request that it seems like my browser automatically makes when doing a POST
|
2019-03-25T10:03:24.697000
|
Luba
|
elmlang
|
general
|
> We had a “getting started with haskell” brownbag session. And most folks had to compile IDE support
The problem with that is that many people doing Haskell are vi/Emacs users. The guy who does IDE support is a great person, but many in the community are used to generic dev tooling.
|
2019-03-25T10:03:44.697100
|
Caron
|
elmlang
|
general
|
yes, it will send OPTIONS pre-flight, make sure your server can handle it
|
2019-03-25T10:04:31.698000
|
Cindie
|
elmlang
|
general
|
A wonder if perhaps "allow origin" or something like that is different. It doesn't seem like Chromium shows everything in the developer console
|
2019-03-25T10:06:05.698800
|
Luba
|
elmlang
|
general
|
you can google more on this issue
|
2019-03-25T10:11:23.699500
|
Cindie
|
elmlang
|
general
|
What more specifically do you mean?
|
2019-03-25T10:12:05.699800
|
Luba
|
elmlang
|
general
|
Is it a known issue with Elm?
|
2019-03-25T10:12:19.700200
|
Luba
|
elmlang
|
general
|
I mean google for more on "allow origin" and OPTIONS
|
2019-03-25T10:14:26.701200
|
Cindie
|
elmlang
|
general
|
This is a good CORS guide.
<https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS>
|
2019-03-25T10:19:42.701600
|
Jin
|
elmlang
|
general
|
Yeah. I know about that. But I would expect Elm to handle Http.task and Http.request identically.
|
2019-03-25T10:23:26.702900
|
Luba
|
elmlang
|
general
|
I would love to have that <@Caron> :slightly_smiling_face:
|
2019-03-25T10:24:23.703000
|
Valeria
|
elmlang
|
general
|
Ok.
|
2019-03-25T10:26:19.704500
|
Caron
|
elmlang
|
general
|
As far as I could tell Elm set those three headers the same. But I'm not 100%. I'm no longer at my computer at the moment, so I will need to double check that the next time I have a chabce.
|
2019-03-25T10:26:58.705800
|
Luba
|
elmlang
|
general
|
wtf, never had that one
|
2019-03-25T10:42:35.706200
|
Niesha
|
elmlang
|
general
|
Our team is now at PureScript - it works. Not as fast as Rust, but pleasant to work with
|
2019-03-25T10:42:56.706400
|
Niesha
|
elmlang
|
general
|
A bit newer guideline on which extensions to use: <https://lexi-lambda.github.io/blog/2018/02/10/an-opinionated-guide-to-haskell-in-2018/>
|
2019-03-25T10:44:18.706600
|
Niesha
|
elmlang
|
general
|
`stack` solved most of our ecosystem issues. The IDE support still isn't great.
|
2019-03-25T10:45:09.706900
|
Niesha
|
elmlang
|
general
|
At least compared to PureScript
|
2019-03-25T10:45:28.707200
|
Niesha
|
elmlang
|
general
|
Hi all - how can I `uriEncode` a string? `Http` 1.x had this function but it has been removed in 2.x.
|
2019-03-25T14:08:44.708700
|
Tisa
|
elmlang
|
general
|
Check out <https://package.elm-lang.org/packages/elm/url/latest/Url-Builder#QueryParameter>
|
2019-03-25T14:24:20.708900
|
Dede
|
elmlang
|
general
|
Maybe you can fake something out of that?
|
2019-03-25T14:24:36.709100
|
Dede
|
elmlang
|
general
|
Wait, better answer: <https://package.elm-lang.org/packages/elm/url/latest/Url#percentEncode>
|
2019-03-25T14:25:39.709300
|
Dede
|
elmlang
|
general
|
Is there any package for rendering graphs which supports click/touch to drag stuff?
|
2019-03-25T15:30:31.710000
|
Kris
|
elmlang
|
general
|
do you want this to be force-directed? elm-visualization has an example where you can drag the nodes, but then the force-direction kicks in and make the layout a little nicer. see also <https://erkal.github.io/kite/>
|
2019-03-25T15:39:18.711300
|
Virgie
|
elmlang
|
general
|
elm-visualization example: <https://code.gampleman.eu/elm-visualization/ForceDirectedGraph/>
|
2019-03-25T15:40:13.711500
|
Virgie
|
elmlang
|
general
|
Yes, that's a pretty cool example
|
2019-03-25T15:54:11.711800
|
Kris
|
elmlang
|
general
|
Thanks!
|
2019-03-25T15:54:15.712000
|
Kris
|
elmlang
|
general
|
`terezka/line-charts` supports clicks and dragging with some setup, see <https://terezka.github.io/line-charts/>
|
2019-03-25T16:17:08.713000
|
Agustin
|
elmlang
|
general
|
I'll check it out, that kite looks like what I need but it doesn't provide that as a library, but as the whole project
|
2019-03-25T16:18:34.713800
|
Kris
|
elmlang
|
general
|
hey everyone
any idea how to do jsonp request in Elm ?
|
2019-03-25T17:49:36.714300
|
Floy
|
elmlang
|
general
|
basically am trying to access wakatime embedables
|
2019-03-25T17:53:28.714600
|
Floy
|
elmlang
|
general
|
and that nasty thing works over jsonp...as far as I can tell from the snippet on their page
|
2019-03-25T17:53:59.714800
|
Floy
|
elmlang
|
general
|
Hm, I appear to get plain old JSON responses :thinking_face:
|
2019-03-25T18:08:18.715300
|
Huong
|
elmlang
|
general
|
e.g. <https://wakatime.com/share/@731fa8ee-eb30-4de1-912a-bbea6fcef812/4cfa1d8c-45e2-431d-affe-29638cef24e2.json>
|
2019-03-25T18:08:22.715500
|
Huong
|
elmlang
|
general
|
yeah....it is
|
2019-03-25T18:16:18.715700
|
Floy
|
elmlang
|
general
|
but in elm I get `Network failure` :confused:
|
2019-03-25T18:16:26.715900
|
Floy
|
elmlang
|
general
|
no sorry
|
2019-03-25T18:16:36.716100
|
Floy
|
elmlang
|
general
|
`NetworkError`
|
2019-03-25T18:16:39.716300
|
Floy
|
elmlang
|
general
|
which doesn't make any sense
|
2019-03-25T18:16:57.716600
|
Floy
|
elmlang
|
general
|
since I am on this slack
|
2019-03-25T18:17:04.716800
|
Floy
|
elmlang
|
general
|
+ Netflix is running
|
2019-03-25T18:17:13.717000
|
Floy
|
elmlang
|
general
|
:confused:
|
2019-03-25T18:17:14.717200
|
Floy
|
elmlang
|
general
|
<@Huong> URL is 100% correct, I can copy it into the browser and everything is ok
|
2019-03-25T18:18:14.717400
|
Floy
|
elmlang
|
general
|
Am I not looking at CORS request?
|
2019-03-25T18:20:49.717600
|
Floy
|
elmlang
|
general
|
oh...bugger...in the old code I've been using `jsonp` node module to do this request :confused:
|
2019-03-25T18:23:36.717800
|
Floy
|
elmlang
|
general
|
You'll get `Network Failure` if CORS doesn't allow the request.
|
2019-03-25T18:26:00.718000
|
Earlean
|
elmlang
|
general
|
that's really inconvienient
|
2019-03-25T18:33:23.718200
|
Floy
|
elmlang
|
general
|
wonder if the only way is to port the module to Elm via ports or is there some header to set ;/
|
2019-03-25T18:33:40.718400
|
Floy
|
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